AudioManager: mark deprecated call routing API as such

Add @Deprecated annotation to call audio routing methods that have
been replaced by setDeviceForCommunication() API in Android SC:
- startBluetoothSco()
- stopBluetoothSco()
- isBluetoothScoOn()
- setSpeakerPhoneOn()
- isSpeakerPhoneOn()

Bug: 197043248
Test: make
Change-Id: I32daaaabaf6498a2ddfcaa7a4137d15b75722596